Changes in the atmospheric helium isotope ratio over the past 40 years Public Deposited

http://ir.library.oregonstate.edu/concern/articles/0c483m200

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The article is copyrighted by the American Geophysical Union. It can be found at:  http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-8007.

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  • We have compared the helium isotope ratio in five samples of Pacific marine air spanning the 40 year period between 1973 and 2013 against a secondary gas standard. In a separate experiment we directly compared the ³He/⁴He ratio in air samples collected in 1973 and 2013 at the same location in La Jolla, California, eliminating any geographical bias. Both experiments are consistent with zero time rate of change for atmospheric ³He/⁴He. Our best estimate for the rate of change of the ³He/⁴He ratio in Pacific marine air is -0.0014 ± 0.0045%/yr (2σ), indicating that air helium is still a valid standard for terrestrial helium isotope measurements.
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  • Lupton, J., and L. Evans (2013), Changes in the atmospheric helium isotope ratio over the past 40 years, Geophysical Research Letters, 40, 6271–6275. doi:10.1002/2013GL057681
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